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NEET UG Nuclei — practice questions — page 3

Explore 102 free Nuclei questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Nuclei questions and exercises with answers

Showing questions 61–90 of 102.

How close did a 5.5 MeV alpha particle get to a gold nucleus?Read the answer and worked solution →Accurate nuclear sizes were measured by scattering which projectiles?Read the answer and worked solution →In R = R0 A^(1/3) for nuclear radius, what is R0?Read the answer and worked solution →How does nuclear density vary with mass number A?Read the answer and worked solution →Approximately what is the density of nuclear matter?Read the answer and worked solution →What is the ratio of nuclear radii for mass numbers 125 and 27?Read the answer and worked solution →Matter in which astronomical object has density comparable to a nucleus?Read the answer and worked solution →If 1 g of matter is fully converted to energy, how much energy results?Read the answer and worked solution →One atomic mass unit is equivalent to how much energy?Read the answer and worked solution →How does a nucleus's mass compare with the total mass of its free nucleons?Read the answer and worked solution →What is the mass defect of the oxygen-16 nucleus?Read the answer and worked solution →Oxygen-16 has a binding energy of 127.5 MeV. What is its binding energy per nucleon?Read the answer and worked solution →Binding energy per nucleon peaks at about 8.75 MeV near which mass number?Read the answer and worked solution →About what is the binding energy per nucleon for A = 238?Read the answer and worked solution →For which nuclei is binding energy per nucleon lower than the middle range?Read the answer and worked solution →Which correctly orders the forces from strongest to weakest?Read the answer and worked solution →How does the nuclear force between two nucleons behave below about 0.8 fm?Read the answer and worked solution →How does the nuclear force depend on the charge of the nucleons?Read the answer and worked solution →Beyond what separation does the nuclear force fall almost to zero?Read the answer and worked solution →Becquerel first saw radioactivity using which compound?Read the answer and worked solution →Which particles are emitted in beta decay?Read the answer and worked solution →What is emitted in gamma decay?Read the answer and worked solution →Fission of 1 kg of uranium yields about how much energy?Read the answer and worked solution →Nuclear process energies are roughly how many times chemical ones?Read the answer and worked solution →About how much energy is released per uranium nucleus that fissions?Read the answer and worked solution →An A = 240 nucleus (7.6 MeV per nucleon) splits into two A = 120 nuclei (8.5 MeV). Energy released?Read the answer and worked solution →U-235 captures a neutron and splits into Ba-144 and Kr-89. How many neutrons are freed?Read the answer and worked solution →How do fission fragments reach stable end products?Read the answer and worked solution →What is the energy source in nuclear power reactors?Read the answer and worked solution →In the first step of the sun's proton-proton cycle, two protons form what?Read the answer and worked solution →

Worked practice questions

How close did a 5.5 MeV alpha particle get to a gold nucleus?

  1. About 4.0 x 10^-14 m
  2. About 1.2 x 10^-15 m
  3. About 5.3 x 10^-11 m
  4. About 2.3 x 10^-17 m
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Correct answer: A. About 4.0 x 10^-14 m

Geiger and Marsden's data gave a closest approach of about 4.0 x 10^-14 m, an upper limit on the nuclear size.

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Accurate nuclear sizes were measured by scattering which projectiles?

  1. Slow neutrons
  2. Heavy ions
  3. Visible photons
  4. Fast electrons
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Correct answer: D. Fast electrons

Bombarding targets with fast electrons gave precise radii for nuclei of many elements.

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In R = R0 A^(1/3) for nuclear radius, what is R0?

  1. About 1.2 fm
  2. About 12 fm
  3. About 0.8 fm
  4. About 0.12 fm
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Correct answer: A. About 1.2 fm

The constant R0 is about 1.2 fm, that is 1.2 x 10^-15 m.

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